题文
When Edison was only a boy of thirteen, he earned a living, _____ newspapers in the street.
| A．to sell |
| B．sold |
| C．selling |
| D．having sold |
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When Edison was only a boy of thirteen, he earned a living, _____ newspapers in the street.
| A．to sell |
| B．sold |
| C．selling |
| D．having sold |
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